Hmm, how to define? Plenty of crazy people are happy...
Before his LSD days, Tim Leary did a study that concluded that every intervention (from Voo Doo to Freud Ian therapy) gets the same results: 1/3 of the patients get better, 1/3 stay the same, 1/3 get worse. So the trick is finding the thing that works for you.
Laughter as therapy:
http://www.catholicdigest.org/stories/20030202.html (haha, nobody expects the Spanish Inquisition)
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